I have the radiator core from my old M5 laying around. It doesnt leak, only switched due to the end tank cracking, but the core is good.
I can ship overseas at a reasonable rate as my friend works for FEDEX.
Good for mock up, or use, whatever you want.
No idea on its value, but I can beat any online price.
Let me know
Pics:
Guaranteed not to leak or your money back